Correlation between Viscoelastic Moduli and Atomic Rearrangements in Metallic Glasses

Dynamical moduli, such as storage and loss moduli, characterize the viscoelasticity of materials (i.e., time-dependent elasticity) and convey important information about the relaxation processes of glasses and supercooled liquids. A fundamental question is what ultimately determines them in glassy m...

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Published inThe journal of physical chemistry letters Vol. 7; no. 19; pp. 3747 - 3751
Main Authors Yu, Hai-Bin, Richert, Ranko, Samwer, Konrad
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 06.10.2016
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Summary:Dynamical moduli, such as storage and loss moduli, characterize the viscoelasticity of materials (i.e., time-dependent elasticity) and convey important information about the relaxation processes of glasses and supercooled liquids. A fundamental question is what ultimately determines them in glassy materials. Here, for several model metallic glasses, we demonstrate that both the storage and loss moduli are uniquely determined by the most probable atomic nonaffine displacements, regardless of temperature or frequency. Moreover, the fast-moving atoms (which contribute to dynamical heterogeneity) do not contribute explicitly to the moduli. Our findings provide a physical basis for the origin of viscoelasticity in metallic glasses.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.6b01738